World Health Organisation raises health alert as rare Hantavirus cluster aboard Atlantic vessel triggers the launch of global contact tracing across many countries.
A possible case of hantavirus infection on board the MV Hondius cruise liner appears to have become even more serious, after the number of infections grew to eight, causing the World Health Organisation (WHO) to start conducting global contact tracing. With approximately 150 passengers and crew aboard MV Hondius, the situation continues to develop into a multi-national health crisis.
Cases climb, deaths reported
Based on information from the World Health Organization, eight patients, both laboratory-confirmed and suspected, have been found on board the cruise liner. Previously, there had been reports of seven patients, two being laboratory-confirmed and five suspects, along with three deaths.
Among the deceased was a Dutch man who identified symptoms in early April and later died, his wife, who got infected, also died after being moved to South Africa, including a passenger who died on board.
Swiss authorities have confirmed a case of #hantavirus identified in a passenger from the MV Hondius cruise ship.
— World Health Organization (WHO) (@WHO) May 6, 2026
He had responded to an email from the ship’s operator informing the passengers of the health event, and presented himself to a hospital in Zurich, Switzerland, and… pic.twitter.com/4mmBd7qSA4
Health officials said one patient remains in intensive care in South Africa, while others have reported milder symptoms such as fever and gastrointestinal illness.
The outbreak unfolded during the ship’s voyage from Ushuaia, Argentina, toward the Atlantic, with cases emerging over several weeks in April.
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WHO Begins Global Contact Tracing?
WHO is working on extensive tracing among several countries, especially targeting the passengers who landed and those who were exposed through medical evacuation and flights.
A major worry is for the patient who flew by plane to Johannesburg and died of the disease on April 26th.
Thus, tracing becomes necessary among the passengers and crew members of that flight.
In a post on X, the WHO said Swiss authorities had confirmed a hantavirus case in a passenger from the cruise ship after the individual responded to a health alert sent by the vessel’s operator and sought treatment at a hospital in Zurich.
Transmission Concerns And Risk Assessment
WHO announced that the virus responsible for the outbreak was the hantavirus Andes strain, which is extremely rare, as it can spread between humans in small numbers.
The identification of the strain was made by the National Institute for Communicable Diseases in South Africa and the Geneva University Hospitals in Switzerland.
Despite the alarming signs and symptoms, the WHO has still insisted that the risk for the population as a whole is relatively low and that no travel bans are currently needed.
The passengers and the crew onboard have been kept in isolation, where they will undergo some tests and monitoring by health experts.
Ongoing response and next steps
The ship owned by Oceanwide Expeditions had been having problems with docking at different ports after Cape Verde turned it away based on public health concerns. The ship and its passengers were under observation from the WHO and other health authorities, who were running lab tests on the disease.
There are also attempts to trace the route the disease took in case there is a new infection. The cause remains unclear – whether this outbreak was caused by an infected crew member or passenger.
It seems that cruise ships present a unique problem when it comes to the spread of communicable diseases since the outbreak needs to be contained quickly and efficiently.
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